xref: /PHP-7.3/ext/standard/rand.c (revision 9afce019) 
1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 7                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1997-2018 The PHP Group                                |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 3.01 of the PHP license,      |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.php.net/license/3_01.txt                                  |
11    | If you did not receive a copy of the PHP license and are unable to   |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@php.net so we can mail you a copy immediately.               |
14    +----------------------------------------------------------------------+
15    | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
16    |          Zeev Suraski <zeev@php.net>                                 |
17    |          Pedro Melo <melo@ip.pt>                                     |
18    |          Sterling Hughes <sterling@php.net>                          |
19    |                                                                      |
20    | Based on code from: Richard J. Wagner <rjwagner@writeme.com>         |
21    |                     Makoto Matsumoto <matumoto@math.keio.ac.jp>      |
22    |                     Takuji Nishimura                                 |
23    |                     Shawn Cokus <Cokus@math.washington.edu>          |
24    +----------------------------------------------------------------------+
25  */
26 
27 #include "php.h"
28 #include "php_rand.h"
29 #include "php_mt_rand.h"
30 
31 /* {{{ php_srand
32  */
php_srand(zend_long seed)33 PHPAPI void php_srand(zend_long seed)
34 {
35 	php_mt_srand(seed);
36 }
37 /* }}} */
38 
39 /* {{{ php_rand
40  */
php_rand(void)41 PHPAPI zend_long php_rand(void)
42 {
43 	return php_mt_rand();
44 }
45 /* }}} */
46 
47 /* {{{ proto int mt_rand([int min, int max])
48    Returns a random number from Mersenne Twister */
PHP_FUNCTION(rand)49 PHP_FUNCTION(rand)
50 {
51 	zend_long min;
52 	zend_long max;
53 	int argc = ZEND_NUM_ARGS();
54 
55 	if (argc == 0) {
56 		RETURN_LONG(php_mt_rand() >> 1);
57 	}
58 
59 	ZEND_PARSE_PARAMETERS_START(2, 2)
60 		Z_PARAM_LONG(min)
61 		Z_PARAM_LONG(max)
62 	ZEND_PARSE_PARAMETERS_END();
63 
64 	if (max < min) {
65 		RETURN_LONG(php_mt_rand_common(max, min));
66 	}
67 
68 	RETURN_LONG(php_mt_rand_common(min, max));
69 }
70 /* }}} */
71 
72 /*
73  * Local variables:
74  * tab-width: 4
75  * c-basic-offset: 4
76  * End:
77  * vim600: noet sw=4 ts=4 fdm=marker
78  * vim<600: noet sw=4 ts=4
79  */
80